Firms paid to shut down wind farms when the wind is blowing - Telegraph
Pumped-storage hydroelectricity - Wikipedia, the free encyclopediaThe electricity cannot be stored, so one solution – known as the 'balancing mechanism' – is to switch off or reduce the power supplied.
There's always SOMETHING you can do with it, and a nice head of water is an excellent storage medium.
Plus, hydro can go from zero to peak output and back to zero in the time it takes to turn a tap.
Failing that, ALL spare capacity should be shunted into the electrolysis plants cracking water into hydrogen (which can be stored and then 'burned' to release energy on demand).